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US 11,072,682 B2Granted
Liquid cyclopentene ring-opened polymer, rubber composition, and rubber crosslinked product
AssigneeZeon Corporation
InventorShingo Okuno
Life of this patent
Estimating the term…
Abstract
A liquid cyclopentene ring-opened polymer having a weight average molecular weight (Mw) of 1,000 to 50,000 and a cis double content of 55% or more in repeating units.
Claims8
A rubber composition comprising
- 100 parts by weight of a solid rubber,
- 1 to 100 pars by weight of a liquid cyclopentene ring-opened polymer having a weight average molecular weight (Mw) of 2,000 to 20,000 and a cis double bond content of 55% or more in repeating units, and
- a cross-linker.
A method for producing the liquid cyclopentene ring-opened polymer having a weight average molecular weight (Mw) of 2,000 to 20,000 and a cis double bond content of 55% or more in repeating units, comprising:
- performing ring-opening polymerization of a monomer including cyclopentene at a polymerization temperature of 20° C. to 80° C. using a chain transfer agent and polymerization catalysts including a transition metal compound (A) of Group 6 in the periodic table and an organoaluminum compound (B) represented by general formula (1):
- (R1)3-xAl(OR2)x (1)
- wherein R1 and R2 each represent a C1-20 hydrocarbon group, and X satisfies 0<X<3.
Dependencies are inferred from the claim text.